name and ethnicity don't match up

I'm biracial, with one parent coming from a developing nation. On my apps, I marked myself as that ethnicity, and part of my PS was about how being from that ethnic group shaped my decision to pursue law, among other things (ie studying trafficking of women as my honors thesis, deciding to work for a non-profit, etc).

Now, the problem is, since I'm biracial... my last name is distinctly white. Sort of like Smith or Jones, along those lines (except not British).

Now, will the adcomms do a double-take when they see my name, and think I'm trying to BS them? (I'm not trying to...)

I know a young black attorney with a very Jewish name (think along the lines of "Noah Feldman" or "Josh Finkelstein") and he has never seemed to encounter any problems about it. Just describe your racial-ethnic identity in a way that makes sense to you and is truthful; the rest will fall into place.

My family name is distincly English, but only because my grandfather (my father's dad) was adopted. So my name is completely white sounding. Ironic because I am quite white looking as well. However, one side of my family is Mexican.